async static public Task <CosmoDbFeatureClass> Create(CosmoDbDataset dataset, Json.SpatialCollectionItem spatialCollectoinItem)
{
var fc = new CosmoDbFeatureClass();
fc.Dataset = dataset;
fc.Name = spatialCollectoinItem.Name;
if (spatialCollectoinItem.GeometryDef != null)
{
fc.HasZ = spatialCollectoinItem.GeometryDef.HasZ;
fc.HasM = spatialCollectoinItem.GeometryDef.HasM;
fc.GeometryType = spatialCollectoinItem.GeometryDef.GeometryType;
fc.SpatialReference = dataset._spatialReference; // ToDo
}
var fields = new Fields();
if (spatialCollectoinItem.Fields != null)
{
foreach (var field in spatialCollectoinItem.Fields)
{
fields.Add(new Field()
{
name = field.Name,
type = field.FieldType
});
}
}
fc.Fields = fields;
fc.CosmoDocumentClient = dataset._client;
fc.CosmoDocumentCollection = dataset.GetFeatureCollection(fc.GeometryType);
fc.Envelope = null;
using (var cursor = new CosmoDbFeatureCursor(fc, new QueryFilter()))
{
IFeature feature = null;
while ((feature = await cursor.NextFeature()) != null)
{
if (feature.Shape == null)
{
continue;
}
if (fc.Envelope == null)
{
fc.Envelope = feature.Shape.Envelope;
}
else
{
fc.Envelope.Union(feature.Shape.Envelope);
}
}
}
return(fc);
}
async public Task <IDataset2> EmptyCopy()
{
var dataset = new CosmoDbDataset();
await dataset.SetConnectionString(ConnectionString);
await dataset.Open();
return(dataset);
}
